Warning: session_start(): open(/var/php/sess_jbk3j1c9fld2b6n120k77bc6i5, O_RDWR) failed: No such file or directory (2) in /Applications/XAMPP/xamppfiles/htdocs/rsapptpro_repeatappt/libraries/joomla/session/session.php on line 532

The directory XAMPP/var/php does exist, and permissions are set to 777 from the XAMPP directory all the way down to /var/php.

Furthermore, the session file ( sess_jbk3j1c9fld2b6n120k77bc6i5 ) appears to have been created.The session portion of the php.ini file is as follows:

; Argument passed to save_handler. In the case of files, this is the path; where data files are stored. Note: Windows users have to change this; variable in order to use PHP's session functions.;; The path can be defined as:;; session.save_path = "N;/path";; where N is an integer. Instead of storing all the session files in; /path, what this will do is use subdirectories N-levels deep, and; store the session data in those directories. This is useful if you; or your OS have problems with lots of files in one directory, and is; a more efficient layout for servers that handle lots of sessions.;; NOTE 1: PHP will not create this directory structure automatically.; You can use the script in the ext/session dir for that purpose.; NOTE 2: See the section on garbage collection below if you choose to; use subdirectories for session storage;; The file storage module creates files using mode 600 by default.; You can change that by using;; session.save_path = "N;MODE;/path";; where MODE is the octal representation of the mode. Note that this; does not overwrite the process's umask.; http://php.net/session.save-path;session.save_path = "/tmp"session.save_path="/var/php"